ざっくりわかるDDD (戦術的のみ)

by ミツバEX

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ͬ͘͟ΓΘ͔ΔDDD (ઓज़తͷΈ) ϛπό

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ࣗݾ঺հ • ϛπόʢM2ʣ • @EX46900521 • य़͔Β౦ژ • Haskell, Go

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ࠓ೔࿩͢͜ͱ • υϝΠϯۦಈઃܭͷงғؾ • Α͘࢖ΘΕΔΞʔΩςΫνϟʢઓज़తDDDʣ • υϝΠϯۦಈઃܭͰɼؾΛ͚ͭΔ͜ͱ

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ࠓ೔࿩͞ͳ͍͜ͱ • υϝΠϯۦಈઃܭΛ׬શʹཧղ͢Δ • ओʹϞσϦϯάͷ࿩͸͠ͳ͍ʢઃܭͰ͸͕͜͜ॏཁʣ • ϞσϦϯάʹؔͯ͠͸͜ͷεϥΠυ͕Θ͔Γ΍͘͢ ͯΑ͞Έʹ͋;Ε͍ͯ·͢ɽ • https://speakerdeck.com/smdmts/ddd-for- engineer-newbie

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υϝΠϯۦಈઃܭͷඞཁੑ • มߋʹڧ͍ίʔυΛॻ͖͍ͨ • ϩδοΫΛͲ͜ʹஔ͔͘໰୊ʹରͯ͠ਅ݋ʹ ઓ͍ͬͯ͘

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υϝΠϯ = ۀ຿ͷؔ৺ࣄ

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υϝΠϯۦಈઃܭ =   ۀ຿ͷؔ৺ࣄʹண໨ͨ͠ ઃܭख๏

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ۀ຿ͷؔ৺ࣄ • ྫɿ • ਓ͕͓ۚΛࣗ෼ͷޱ࠲ʹৼΓࠐΉ

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ਓ͕ۚΛ෷͏

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ਓ͕ۚΛࣗ෼ͷޱ࠲ʹৼΓࠐΉ 8IP 8IBU 8IBU 8IFSF

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γεςϜ֎෦ͷಈ͖ ৼΓࠐΉ ৼࠐऴྃ ௨஌

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γεςϜ಺෦ͷಈ͖

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γεςϜ಺෦ͷಈ͖ γεςϜ σʔλϕʔε ৼࠐॲཧɼϢʔβ৘ใ֬ೝɼ ࢒ߴ֬ೝɽɽɽFUD

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Q: ͜Ε͸ྑ͍ίʔυͰ͔͢ʁ

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A: ͋·Γྑ͘ͳ͍ίʔυͰ͢

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Կ͕ྑ͘ͳ͍ͷʁ

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Α͘ͳ͍఺ • Ұͭͷϝιου͕ͨ͘͞Μͷ͜ͱΛ͗͢͠ • ςετ͕ॻ͖ͮΒ͍ • ͺͬͱݟͲ͕͜Ͳ͏ಈ͍͍ͯΔͷ͔Θ͔Γ ͮΒ͍

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ͨ͘͞Μ͋ΔॲཧΛ෼͚Δ

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ओͳϩδοΫ • ೝূ֬ೝ • ֹ͕ۚෆਖ਼Ͱͳ͍͔֬ೝʢ਺஋Ҏ֎Ͱ͸ͳ͍ ͔ʣ • ৼࠐॲཧ • ࢒ߴ֬ೝ

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෼ׂɿྑ͍ ݟ௨͠ɿѱ͍

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ݟ௨͠ΛΑ͘͢ΔͨΊͷ  ϨΠϠʔͷߟ͑ํ σʔλͷྲྀΕ͸ Ұํ޲

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֤ϨΠϠʔͷ໾ׂ Ϣʔβೖྗ σʔλͷ ܭࢉɼՃ޻ σʔλͷӬଓԽ ͭͳ͗

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ϨΠϠʔΛ෼͚ΔϝϦοτ • ίʔυͷஔ͖৔ॴΛ໌֬ʹܾΊΒΕΔ • ϩδοΫΛҰՕॴʹूதͯ͠ɼ؅ཧͰ͖Δ • ֤ϨΠϠʔͷؔ܎Λૄ݁߹ʹอͯΔ

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ઌ΄ͲͷίʔυΛϨΠϠʔ෼͚

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ϑΝΠϧߏ੒

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domain/MoneyΫϥε • ֹ͕ۚෆਖ਼Ͱ͸ͳ͍͔ͷ൑ఆΛMoneyΫϥε ʹҠ͢

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domain/AuthenticationService • AuthΛߦ͏ॲཧΛAuthenticationServiceʹҠ ͨ͠

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infra/MoneyRepository

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application/TransferService

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มߋޙ (TransferHandler)

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ͪΐ͍εοΩϦͨ͠

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͓͞Β͍ Ϣʔβೖྗ σʔλͷ ܭࢉɼՃ޻ σʔλͷӬଓԽ ͭͳ͗

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΋͏গ͠ϨΠϠʔ ෼͚ʹ͍ͭͯ

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ૄ݁߹

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ར༻ଆ͕ΠϯλʔϑΣʔεͷΈ Λ༻͍ɼ࣮૷ͱ෼཭͢Δ

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Javaͷinterface

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Cat΍Dogͷத਎Λ஌Δඞཁ ͸ͳ͘ɼશͯAnimalͰOK

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RepositoryपΓͷ࣮ફతͳ࿩

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֤σʔλιʔεͷ੾Γସ͑Λ ༰қʹͰ͖Δ

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લ൒ͷ·ͱΊ • ϨΠϠʔߏ଄ʹͯ͠ɼॲཧΛ෼ׂ͠Α͏ • ΠϯλʔϑΣʔεͷΈΛఏڙ͠ɼϨΠϠʔؒ Λૄ݁߹ʹ

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গ͠࿩Λ໭ͯ͠

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ਓ͕ۚΛࣗ෼ͷޱ࠲ʹৼΓࠐΉ 8IP 8IBU 8IBU 8IFSF

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Ϟϊ • User • E-mail • UserName • ۚ • ੫ֹ

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EntityͱValue Object • Entity • idΛ࣋ͪɼΦϒδΣΫτ͝ͱʹ۠ผ͞Ε͏Δ Ϟϊ • Value Object • ஋ͷΈΛ࣋ͪɼෆมͳΦϒδΣΫτ

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Ϟϊ • User (Entity) • E-mail (Value Object) • UserName (Value Object) • ۚ (Value Object) • ੫ֹ

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૊ΈཱͯΔ (User)

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ϑΝΠϧߏ੒ʢUserʣ

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ϙΠϯτ • શͯͷม਺ΛԿ͔͠ΒͷΫϥεͰϥοϓ͢Δ • Integerܕ΍StringܕͩͱԿΛҙຯ͍ͯ͠Δ ͔Θ͔ΓͮΒ͍

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ू໿ʢAggregateʣ

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ू໿ • Root EntityΛ࣋ͪɼͦͷԼʹෳ਺ͷEntity, Value ObjectΛ࣋ͭͰ͔͍υϝΠϯΦϒδΣ Ϋτ • ࠓճ͸User͕ू໿

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ू໿ͷϧʔϧ • ू໿ҎԼͷ஋Λࢀর͢Δͱ͖͸ඞͣRoot Entityʹ໰͍߹ΘͤΔ • Root Entity͕஋ͷීวੑΛอূ͢Δ

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ͨ͘͞Μͷ஋ΛҰͭͷ  ΦϒδΣΫτʹԡ͠ࠐΊͯ  ؔ৺͝ͱΛ಺෦ʹ

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ΦϒδΣΫτࢦ޲ΤΫααΠζ

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https://gist.github.com/ sambatriste/ 5535b1f0f6a73e9b37239d 86edf61c70

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ϧʔϧ • 1ͭͷϝιουʹ͖ͭΠϯσϯτ͸̍ஈམ • else۟͸ېࢭ • ϓϦϛςΟϒܕͱจࣈྻܕ͸ϥοϓ͢Δ • Ұߦʹ͖ͭυοτ͸Ұͭ • ໊લ͸লུ͠ͳ͍ • શͯͷΤϯςΟςΟΛখ͘͞ • 1ͭͷΫϥεʹ͖ͭɼΠϯελϯεม਺͸ೋͭ·Ͱ • ϑΝʔετΫϥείϨΫγϣϯΛ࢖༻͢Δ • Getter, Setter, ϓϩύςΟΛ࢖༻͠ͳ͍͜ͱ

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શͯͷΤϯςΟςΟΛখ͘͞ • 1ϑΝΠϧ50ߦ • 1ύοέʔδ10ϑΝΠϧ

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ϑΝʔετΫϥείϨΫγϣϯ Λ࢖༻͢Δ • ίϨΫγϣϯΛΫϥεͰϥοϓ͢Δ • ίϨΫγϣϯʹର͢ΔॲཧΛϝιουͰఆٛ Ͱ͖Δར఺͕͋Δ

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Getter, SetterΛར༻͠ͳ͍ • ϩδοΫΛݺͿͷͰ͋ͬͯɼ௚઀஋Λ໰͍߹ ΘͤΔཧ༝Λ࡞Βͳ͍Α͏ʹ͢Δ • ϩδοΫΛҙࣝతʹϞσϧʹ࣮૷͢ΔΑ͏ʹ ͳΔ

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ΦϒδΣΫτࢦ޲ ΤΫααΠζ

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ޙ൒ͷ·ͱΊ • ϞϊΛҙࣝͯ͠ɼϞσϧΛ࡞੒͍ͯ͘͠ • ΦϒδΣΫτࢦ޲ΤΫααΠζͷ࣮ફʹΑΔ ΑΓ෼ׂ͞Εͨίʔυ΁

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DDDͰؾΛ͚ͭΔ͜ͱ • υϝΠϯ૚ͷϩδοΫ͕ଞͷ૚ʹ࿙ΕΔՄೳ ੑ͕͋ΔͷͰ஫ҙ • υϝΠϯϞσϧ͸ҰேҰ༦ͷ΋Ͱ͸ͳ͘ɼΏͬ ͘Γۛຯ͠ͳ͕Β։ൃΛ͢Δ͜ͱ͕େࣄ

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·ͱΊ • ϨΠϠʔΛҙࣝ͠ɼॲཧΛ෼ׂ • ϩδοΫΛҙࣝͯ͠ɼҰՕॴʹूதͤ͞Δ • ΦϒδΣΫτࢦ޲ΤΫααΠζΛҙࣝ͢Δ

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͓·͚

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ϑϩϯτͷΞʔΩςΫνϟ • MVP • MVVM • Flux

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MVP

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MVVM

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Flux https://www.google.co.jp/url?sa=i...

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ϨΠϠʔʹ෼͚ͯؔ৺͝ͱͷ ෼཭Λߦͳ͍ͬͯΔ

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Atomic Design • UI ComponentsΛ5ͭͷϨϕϧʹ෼͚Δ • Atoms • Molecules • Organisms • templates • Pages